Respectable doctor nags pundit (10)
I believe the answer is:
upstanding
'respectable' is the definition.
(I've seen this before)
'doctor nags pundit' is the wordplay.
'doctor' indicates anagramming the letters.
'nags'+'pundit'='nagspundit'
'nagspundit' with letters rearranged gives 'UPSTANDING'.
(Other definitions for upstanding that I've seen before include "Ready for toast" , "as we must be when the judge appears!" , "Honest, respectable; erect" .)